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Theorem len-06

⊦ # y = # y0 → (x + y = z + y0 ↔ x = z ∧ y = y0)

Type: A user defined theorem
Validity: The proof is valid.
Features: ws,
Comment:
Used by:
Used by units in proved state: list-del, rowcol-upd, olist, string-less,
Proof exists?: Yes

View the proof

Infos about the proof

Proved?: Yes
Interactions: 3
Proof steps: 6
Used lemmas: a, len, len-01,
Used spec theorems:
- Used simplifier rules: